Source code for mesa.visualization.UserParam

class UserParam:
    _ERROR_MESSAGE = "Missing or malformed inputs for '{}' Option '{}'"

    def maybe_raise_error(self, param_type, valid):
        if valid:
            return
        msg = self._ERROR_MESSAGE.format(param_type, self.label)
        raise ValueError(msg)




class Slider(UserParam):
    """
    A number-based slider input with settable increment.

    Example:

    slider_option = Slider("My Slider", value=123, min=10, max=200, step=0.1)

    Args:
        label: The displayed label in the UI
        value: The initial value of the slider
        min: The minimum possible value of the slider
        max: The maximum possible value of the slider
        step: The step between min and max for a range of possible values
        dtype: either int or float
    """

    def __init__(
        self,
        label="",
        value=None,
        min=None,
        max=None,
        step=1,
        dtype=None,
    ):
        self.label = label
        self.value = value
        self.min = min
        self.max = max
        self.step = step

        # Validate option type to make sure values are supplied properly
        valid = not (self.value is None or self.min is None or self.max is None)
        self.maybe_raise_error("slider", valid)

        if dtype is None:
            self.is_float_slider = self._check_values_are_float(value, min, max, step)
        else:
            self.is_float_slider = dtype == float

    def _check_values_are_float(self, value, min, max, step):
        return any(isinstance(n, float) for n in (value, min, max, step))

    def get(self, attr):
        return getattr(self, attr)